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    "# 1.1 运行之后，输入支付宝余额，打印商品列表\n",
    "goods_list = [\n",
    "    #[名称，价格]\n",
    "    ['珍珠奶茶',7],\n",
    "    ['大杯珍珠奶茶',9.5],\n",
    "    ['桶装珍珠奶茶',18]\n",
    "]\n",
    "user_shopping_car = [\n",
    "    \n",
    "]\n",
    "Alipay = int(input(\"请输入您的账户余额：\"))\n",
    "\n",
    "while True:\n",
    "    print(\"------ 欢迎选购 请输入商品编号 -----\")\n",
    "    \n",
    "    for i in range(len(goods_list)):\n",
    "        print(\"编号：%s，名称：%s,价格：%s\"%(i,goods_list[i][0],goods_list[i][1]))\n",
    "\n",
    "# 2.让用户输入商品编号进行商品的购买\n",
    "# 1.用户输入的内容是否符合规范(用户购买的商品还有没有)?\n",
    "\n",
    "# 思考：用户除了输入数值之外，有没有可能输入的不是数值？\n",
    "\n",
    "choice = input(\"请正确输入购买商品的编号\")\n",
    "if choice.isdigit(): # isdigit判断字符串里的内容是否是数值\n",
    "    choice = int(choice)\n",
    "    if choice > len(goods_list):\n",
    "        #  b.如果没有该商品，返回没有\n",
    "        print(\"您选择的商品不存在\")\n",
    "    else:\n",
    "        #  a.如果有 判断金额是否够 ：用户金额Alipay  商品的金额 goods)list[choice][1]\n",
    "        if Alipay > goods_list[choice][1]:\n",
    "            # 用户余额 1.增加该商品到用户购物车 2. 扣除余额\n",
    "            user_shopping_car.append(goods_list[choice])\n",
    "            Alipay = Alipay - goods_list[choice][1]\n",
    "            print(\"【%s】已经加入了您的购物车，您的【账户余额】还有：%s 元%\"%(goods_list[choice][1]))\n",
    "        else:\n",
    "            print(\"您的余额不足，请更换支付方式\")\n",
    "elif choice == \"q\":\n",
    "    # 用户退出购买\n",
    "    print(\"用户购物车：\",user_shopping_car)\n",
    "    print(\"您的余额还有：\",Alipay)\n",
    "    break\n",
    "else:\n",
    "    print(\"请输入【商品编号】！！或者按照输入提示进行输入\")"
   ]
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